<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
  <%
  request.setAttribute("user", "李四");
  session.setAttribute("user", "张三");
  application.setAttribute("user", "王五");
  %>
    <P> ${"HELLO" }</P>
     <P> ${2+3 }</P>
     <P> ${2>3 }</P>
     <P> ${empty user }</P>
     <%-- <P> ${sessionScope.user }</P> --%>
     <P> ${user }</P>
     <p>${param.name }</p>
     <P>${pageContext.servletContext.contextPath }</P>
     <p>${cookie.JSESSIONID.value }</p>
     <form action="bbb.jsp" method="get">
     <input type="text" name="uname"/>
     <input type="submit" value="提交">
     </form>
</body>
</html>